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        <h1 id="什么是LLDB？"><a href="#什么是LLDB？" class="headerlink" title="什么是LLDB？"></a>什么是LLDB？</h1><p>LLDB是一款调试器。自Xcode 5后，LLDB就成为Xcode默认调试器。<br>以下说明摘自官方网站：<a href="http://lldb.llvm.org" target="_blank" rel="external">http://lldb.llvm.org</a></p>
<blockquote>
<p>LLDB is a next generation, high-performance debugger. It is built as a set of reusable components which highly leverage existing libraries in the larger LLVM Project, such as the Clang expression parser and LLVM disassembler.<br>LLDB is the default debugger in Xcode on Mac OS X and supports debugging C, Objective-C and C++ on the desktop and iOS devices and simulator.<br>All of the code in the LLDB project is available under the standard LLVM License, an open source “BSD-style” license.</p>
</blockquote>
<h1 id="为什么使用LLDB？"><a href="#为什么使用LLDB？" class="headerlink" title="为什么使用LLDB？"></a>为什么使用LLDB？</h1><ol>
<li>在调试方面，Xcode能做的LLDB都能做，并且LLDB拥有更多的功能；</li>
<li>你可以在程序运行时，编写并运行新的代码；</li>
<li>你可以使用python为调试器编写额外的功能；</li>
</ol>
<a id="more"></a>
<h1 id="如何访问到LLDB？"><a href="#如何访问到LLDB？" class="headerlink" title="如何访问到LLDB？"></a>如何访问到LLDB？</h1><p>程序执行到断点:</p>
<p><img src="http://7xr5jb.com1.z0.glb.clouddn.com/LLDB%23access_LLDB1.png" alt="accessLLDB1"></p>
<p>或者点击控制台上方的暂停键:</p>
<p><img src="http://7xr5jb.com1.z0.glb.clouddn.com/LLDB%23access_LLDB2_0.png" alt="accessLLDB2_0"><br><img src="http://7xr5jb.com1.z0.glb.clouddn.com/LLDB%23access_LLDB2_1.png" alt="accessLLDB2_1"></p>
<p>需要注意注意的是，通过点击暂停键的方式访问LLDB，不能直接访问到当前ViewController的变量和方法，但你仍然可以访问到程序的全局变量。</p>
<h1 id="LLDB-基本命令"><a href="#LLDB-基本命令" class="headerlink" title="LLDB 基本命令"></a>LLDB 基本命令</h1><h3 id="po"><a href="#po" class="headerlink" title="po"></a>po</h3><blockquote>
<p>Printing the ObjC “description” of an object.</p>
</blockquote>
<p>输出对象的“description”。<br>可以用于对象 或 有返回值的表达式。</p>
<p><img src="http://7xr5jb.com1.z0.glb.clouddn.com/LLDB%23po.png" alt="poCommand"></p>
<h3 id="p"><a href="#p" class="headerlink" title="p"></a>p</h3><p>用法和”po”一样，但输出的内容更丰富。输出内容包括类型，地址，字面量.</p>
<p><img src="http://7xr5jb.com1.z0.glb.clouddn.com/LLDB%23p.png" alt="pCommand"></p>
<h2 id="breakpoint-相关命令"><a href="#breakpoint-相关命令" class="headerlink" title="breakpoint 相关命令"></a>breakpoint 相关命令</h2><p>breakpoint可缩写为 br。</p>
<h3 id="列出所有断点"><a href="#列出所有断点" class="headerlink" title="列出所有断点"></a>列出所有断点</h3><p><code>br l</code></p>
<p><img src="http://7xr5jb.com1.z0.glb.clouddn.com/LLDB%23br_l.png" alt="br_l"></p>
<h3 id="删除指定编号的断点"><a href="#删除指定编号的断点" class="headerlink" title="删除指定编号的断点"></a>删除指定编号的断点</h3><p><code>br delete &lt;id&gt;</code></p>
<p><img src="http://7xr5jb.com1.z0.glb.clouddn.com/LLDB%23br_delete.png" alt="br_delete"></p>
<h3 id="添加一个断点"><a href="#添加一个断点" class="headerlink" title="添加一个断点"></a>添加一个断点</h3><p><code>b &lt;file&gt;:&lt;line&gt;</code></p>
<p><img src="http://7xr5jb.com1.z0.glb.clouddn.com/LLDB%23addBreakpoint.png" alt="addBr"></p>
<p>在ViewController.m文件的20行添加了断点，断点id为2。即使Xcode界面没有显示出来，但断点确实已经添加了，通过 “br l”命令可以查看到，程序执行到20行时，断点会被正常触发。</p>
<h3 id="关闭-disable-一个断点"><a href="#关闭-disable-一个断点" class="headerlink" title="关闭 (disable)一个断点"></a>关闭 (disable)一个断点</h3><p><code>br di &lt;id&gt;</code></p>
<pre><code>(lldb) br di 2
</code></pre><h3 id="启用-enable-一个断点"><a href="#启用-enable-一个断点" class="headerlink" title="启用(enable)一个断点"></a>启用(enable)一个断点</h3><p><code>br e &lt;id&gt;</code></p>
<pre><code>(lldb) br e 2
</code></pre><h3 id="添加一个通配断点"><a href="#添加一个通配断点" class="headerlink" title="添加一个通配断点"></a>添加一个通配断点</h3><p><code>br set -n &lt;symbolic&gt;</code></p>
<p>eg: 为程序所有的viewDidLoad方法设置断点</p>
<pre><code>(lldb) br set -n viewDidLoad
</code></pre><h3 id="条件断点"><a href="#条件断点" class="headerlink" title="条件断点"></a>条件断点</h3><p>给断点设置条件，只有满足条件时才触发断点。</p>
<p><code>br mod -c “&lt;condition&gt;” &lt;id&gt;</code></p>
<p>eg: 当 “self.count &gt; 100”时，断点2才会被触发</p>
<pre><code>(lldb) br mod -c &quot;self.count &gt; 100&quot; 2
</code></pre><h3 id="给断点添加命令"><a href="#给断点添加命令" class="headerlink" title="给断点添加命令"></a>给断点添加命令</h3><p>给断点添加命令，断点触发时自动执行。<br><code>br com add &lt;id&gt;</code></p>
<p><img src="http://7xr5jb.com1.z0.glb.clouddn.com/LLDB%23br_command1.png" alt="addCommandToBr1"></p>
<p>上图命令的含义是：</p>
<ol>
<li>通过po打印了 self.count的值；</li>
<li>将 self.count 赋值101 （expr 命令在后续章节介绍）；</li>
<li>再次通过po打印 self.count的值；</li>
<li>最后用continue命令让程序继续执行。</li>
</ol>
<p>执行结果如下：<br>到达断点2时，自动了执行命令</p>
<p><img src="http://7xr5jb.com1.z0.glb.clouddn.com/LLDB%23br_command_result.png" alt="addCommandToBr2"></p>
<p>我们在程序运行时，执行了新的代码(self.count = 101)，改变了变量 count的值，让程序输出了 “Boom!” !（expr命令很有用，我们将在后续章节做介绍。）<br><em>注：你不仅可以通过在控制台为断点添加命令，也可以通过Xcode的图像界面为断点添加命令：</em></p>
<p><img src="http://7xr5jb.com1.z0.glb.clouddn.com/LLDB%23br_ui.png" alt="addCommandFromXcode"></p>
<p>通过Xcode的图像界面，为断点添加命令有个好处，就是命令会伴随着断点存在。在程序重新运行、Xcode重新启动，命令都不会消失。<br>而通过控制台为断点添加的命令，只在此次运行有效，在程序下一次运行时就不存在了。</p>
<h2 id="流程命令"><a href="#流程命令" class="headerlink" title="流程命令"></a>流程命令</h2><ol>
<li>continue : (Resume Execution)让程序继续执行。</li>
<li>s : (Step In) 进入方法内部。</li>
<li>n : (Step Over)下一行。</li>
<li>finish: (Step Out)从方法内部跳出。</li>
</ol>
<p>Xcode的“debug area”上方有4个按钮，分别代表了以上4个命令：</p>
<p><img src="http://7xr5jb.com1.z0.glb.clouddn.com/LLDB%23processButton.png" alt="processButton"></p>

      
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              <div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-1"><a class="nav-link" href="#什么是LLDB？"><span class="nav-number">1.</span> <span class="nav-text">什么是LLDB？</span></a></li><li class="nav-item nav-level-1"><a class="nav-link" href="#为什么使用LLDB？"><span class="nav-number">2.</span> <span class="nav-text">为什么使用LLDB？</span></a></li><li class="nav-item nav-level-1"><a class="nav-link" href="#如何访问到LLDB？"><span class="nav-number">3.</span> <span class="nav-text">如何访问到LLDB？</span></a></li><li class="nav-item nav-level-1"><a class="nav-link" href="#LLDB-基本命令"><span class="nav-number">4.</span> <span class="nav-text">LLDB 基本命令</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#po"><span class="nav-number">4.0.1.</span> <span class="nav-text">po</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#p"><span class="nav-number">4.0.2.</span> <span class="nav-text">p</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#breakpoint-相关命令"><span class="nav-number">4.1.</span> <span class="nav-text">breakpoint 相关命令</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#列出所有断点"><span class="nav-number">4.1.1.</span> <span class="nav-text">列出所有断点</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#删除指定编号的断点"><span class="nav-number">4.1.2.</span> <span class="nav-text">删除指定编号的断点</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#添加一个断点"><span class="nav-number">4.1.3.</span> <span class="nav-text">添加一个断点</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#关闭-disable-一个断点"><span class="nav-number">4.1.4.</span> <span class="nav-text">关闭 (disable)一个断点</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#启用-enable-一个断点"><span class="nav-number">4.1.5.</span> <span class="nav-text">启用(enable)一个断点</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#添加一个通配断点"><span class="nav-number">4.1.6.</span> <span class="nav-text">添加一个通配断点</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#条件断点"><span class="nav-number">4.1.7.</span> <span class="nav-text">条件断点</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#给断点添加命令"><span class="nav-number">4.1.8.</span> <span class="nav-text">给断点添加命令</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#流程命令"><span class="nav-number">4.2.</span> <span class="nav-text">流程命令</span></a></li></ol></li></ol></div>
            

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